I've heard that when you dream about doing things you have chosen no longer to do it
apparantly means you're better.
However having said that I used to dream about drinking while I was sober for 6 and half years - then I fell off the wagon
I also quit smoking for about 5 years, and I'd often dream about that - I then started again.
So, in my modest oppinion, I don't think the psychologists, or whatever, have quite got the dream thing figuered out yet.